static void Main(string[] args)
        {
            Database.SetInitializer(new DropCreateDatabaseAlways<OracleDbContext>());
            using (OracleDbContext ctx = new OracleDbContext())
            {
                //查询
                if (ctx.AA_USER.Count() == 0)
                {
                }
                var users = ctx.AA_USER.OrderBy(p => p.ID);
                foreach (var u in users)
                {
                    Console.WriteLine("id:{0},name:{1}", u.USER_ID,u.USER_NAME);
                }
                Console.Write("Press any key to continue... ");
                Console.ReadLine();
            }
        }

    }
     public class aa_emp
     {
         public int EmployeeId { get; set; }
         public string Name { get; set; }
         public DateTime HireDate { get; set; }
         //public string Location { get; set; }
     }

     public class AA_USER
     {
         public int ID { get; set; }
         public int USER_ID { get; set; }
         public string USER_NAME { get; set; }
         //public string Location { get; set; }
     }
    public class OracleDbContext : DbContext
    {
        public OracleDbContext() :
            base("OracleDbContext") { }
        //public DbSet<aa_emp> aa_emps { get; set; }
        public DbSet<AA_USER> AA_USER { get; set; }

         protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            try
            {
                modelBuilder.HasDefaultSchema("biz_cw13.");
            }
            catch(Exception ex)
            {

            }
         }
     }